komatik vs travois

komatik

noun
  • A rawhide-lashed sledge with wooden crossbars and runners, first invented and used by the Inuit of Northern Canada, but since used also by non-Inuit people. 

travois

noun
  • A historical frame structure that was used by indigenous peoples, notably the Plains Aboriginals of North America, to drag loads over land, pulled by person, dog, or horse. 

How often have the words komatik and travois occurred in a corpus of books? (source: Google Ngram Viewer )